<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button id="btn">点击</button>
</body>
<script>
    let btn = document.getElementById("btn")
    function throttle(delay) {
        let lasttime = 0
        return function () {
            let nowtime = new Date()
            if (nowtime - lasttime > delay) {
                setTimeout(() => {
                    console.log(nowtime)
                }, delay);
                lasttime = nowtime
            }
        }
    }
    btn.onclick = throttle(2000)
</script>

</html>